Pump



July 17, 1951 R. H.`D|cK|NsoN v 2,560,851

" PUMP v yFiled Dec. 1'7, 1946' Vauro@ l 'B1 wanuw,

Patented July 17, 1951 PUMP* Renaru'riarlana Dickinson, ola-Windsor,- England', assigner to; Ilygroequipmentsv Limited, London, England, 1a British'. company" Application December 17, 1946;"Srial Nof.`71`6;832

In Great BritainNovember-, 1945` section 1, Publieraw 690; Auguste; 1946 Patent expires November 5, 1965 This inventi'bnrlates to'pumpslor liquids and has for-its object to provide-an improvedwconstruction of pump particularly, although not solely,nsuitable for lifting liquids from a depth, as for example, from a bore hole or well and delivering it at any desired height, such pumps being commonly known as deep-lift pumps.

In the accompanying drawings:

Figure 1 represents a simple form of pump according to this invention,

Figure 2 is a part view showing a modified construction, and

Figure 3 shows another modied construction.

Referring first to Figure 1 a pumping installation comprises a reciprocating pump constituted by a piston I driven by any suitable motor II and working in a cylinder I2 which is in free communication with a hydraulic pressure-line I3 which extends downwards from the pump I0 to the point from which liquid is to be pumped. At its lower end I4 the .pressure-line communicates with a delivery-pipe I5 which extends upwards to any desired height to which the liquid is to be delivered. The pressure-line I3 and the delivery pipe I5 thus constitute a U-tube in which the static pressures of two columns can balance one another according to their respective heights.

At the lower end of this U-tube there is a suction-inlet opening I6 communicating with a valve-chamber Il in which a non-return valve I8 permits entry of the liquid to be pumped, into the system, but prevents outward flow therefrom. The delivery-.pipe I5 is shown as terminating at an outletl I9 which may be at any desired height or location with respect to the piston I0.

The cross-sectional area of the delivery pipe I5 is smaller than that of the pressure line I3.

In the operation of this pump the system is primed by filling it with liquid in any convenient manner; when the piston I0 is reciprocated in the cylinder, on the downward or inward stroke, pressure is applied to the pressure-line so that the liquid is forced down and into the deliverypipe at the lower end thereof so as to displace the liquid in the delivery-pipe upwards.

The liquid in the delivery-pipe being thereby set in motion at a higher velocity than the liquid in the pressure-line tends to continue in motion when the piston reaches the inner end of its stroke and stops. This continued motion of the liquid in the delivery pipe draws in more liquid past the suction-valve I8 to maintain the pipesystem lled, so that when the piston moves 5 Claims. (01.'. 10S- 75) outward on its return stroke the pressure-line is also iilled; the nextstroke of the lpiston'repeatS'the-operatiOn, and a quantity of liquid,

equal to the additional liquid which is drawn-in past the suction-valve I8; is expelled through the delivery-pipe on each stroke.

In the modication illustrated in Figure 2 there is provided between the delivery-pipe l5 and the pressure-pipe I3 a cross-connection 2|] near the upper ends of the pipes; this cross-connection is situated at a point near the outward limit of movement of the piston I0 so that it is uncovered as the piston reaches the end of its outward stroke and liquid can flow in from the delivery-pipe into the pressure-line to ensure it being filled ready for the next stroke.

Figure 2 also shows another modification in which a non-return valve 2| is lprovided in the pressure-line near the lower end thereof, this valve being held in its closed position by a spring 22 so as to support to any desired extent the column of liquid above it, whilst permitting free downward flow on the inward stroke of the piston. Since this valve prevents upward flow into the pressure-line, this line is refilled at the end of the outward stroke of the piston IU through the cross-connection 20.

`lin the constructions so far described the pressure-line and delivery-pipe have been illustrated as side by side but in an alternative construction illustrated in Figure 3 they may be co-axial constituting a U-tube whereof one limb is inside the other. The pressure-applying device in the system is shown as a piston Il] similar to that already described, but the pressure-line 33 is made of a diameter sulciently large to accommodate within it the delivery-pipe 345, and the delivery-pipe as already described is of less cross-sectional area than the annular crosssectional area of the pressure-line 33. The suction-inlet-valve 35 is situated at the lower end of a tapering pipe 36 extending upwards from it into the delivery-pipe 34 and the lower end of the delivery-pipe 'is open at 3l to the pressureline 33 so that the operation of this pump is similar to those already described. Communication may be provided under the control of a non-return valve 38 between the delivery-pipe and the lpressure-line 33 and cylinder I2.

There may also be provided in connection with the pressure-line .33 the usual type of air-reservoir 39 for equalizing the variations in pressure produced by a reciprocating pump, and it is a feature of the present arrangement that the communication between the pressure-line 33 and operatively connected to the lower end thereof and extending upwards to the required point of delivery, an opening at the junction of said pipes to the ambient space constituting the sole inlet for the liquid to be pumped, and anon-return inlet valve in said opening.

2. In a pump according to claim 1 the combination with the said delivery pipe, of an openingv therefrom to the upper end of the said pressure line.

3. In a pump according to claim 2 the combination with said opening of a valve movable to permit flow into said pressure line.

4. A pump according to claim 3 wherein the 4 valve is constituted by the piston operating the pump.

5. A pump according to claim 1 wherein the delivery pipe is situated inside the pressure line, and comprising also an air-reservoir communieating with said pressure-line, and an adjustable Valve controlling said communication.

RICHARD HARLAND DICKINSON.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,642,121 McMahon Sept. 13, 1927 1,992,436 McMahon Feb. 26, 1935 2,065,926 Parker Dec. 29, 1936 2,101,833 Bates Dec. 14, 1937 FOREIGN PATENTS Number Country Date 13,975 Great Britain July 1, 1908 623,997 France Mar. 28, 1927 

